CN110056385B - Valve core assembly and reversing valve having the same - Google Patents

Abstract

The invention discloses a valve core assembly, which comprises a liquid inlet valve sleeve, a liquid return valve sleeve in threaded connection with the liquid inlet valve sleeve, a compression bar movably arranged in the liquid return valve sleeve, and a screw sleeve arranged on the liquid return valve sleeve and used for forming threaded connection with a valve body of a reversing valve, wherein the screw sleeve is provided with external threads and is rotatable relative to the liquid return valve sleeve. According to the valve core assembly, the threaded sleeve is arranged on the liquid return valve sleeve to be in threaded connection with the valve body of the reversing valve, so that the liquid inlet valve sleeve cannot be loosened from the liquid return valve sleeve due to friction resistance during disassembly, the reliability of connection between the liquid return valve sleeve and the liquid inlet valve sleeve is improved, and the valve core assembly can be integrally disassembled from the valve body. The invention also discloses a reversing valve.

Description

Valve core assembly and reversing valve having the same

Technical Field

The present invention relates to a hydraulic support for fully mechanized coal mining. Specifically, the present invention relates to a valve core assembly and a reversing valve having the same.

Background technique

In an environment where coal mines are becoming more and more automated and highly efficient in fully mechanized mining, supports with high mining heights and high impedance are becoming more and more popular, and the corresponding control valves have also begun to gradually develop from small flow rates in the past to medium flow rates now. ,Large Flow. In the coal machinery industry, reversing valves are also called control valves or control valves. In the hydraulic support hydraulic system, the reversing valve controls the direction of the fluid flow to realize different actions such as lifting, pushing and pulling the hydraulic support.

At present, the small flow directional valve includes a valve body and a valve core assembly. The valve body is provided with a main liquid inlet hole, a main liquid return hole and two working ports. The main liquid inlet hole and the main liquid return hole are located on the valve body. On the same side of the valve body, the two working ports are respectively located on the other two opposite sides of the valve body. The valve core assembly includes a pressure rod, a liquid return valve sleeve, a liquid inlet valve sleeve and a valve core. The valve core has openings at both ends and a hollow oil passage inside. The liquid return valve sleeve and the liquid inlet valve sleeve are threaded, the liquid return valve sleeve and the valve body are threaded, and threads are provided at both ends of the liquid return valve sleeve.

Although this connection method can improve the integration of the valve core assembly, it will cause a large frictional resistance due to the extrusion of the external sealing ring and the hole in the valve body during the disassembly process of the valve core assembly and the valve body. This kind of friction resistance will cause the liquid return valve sleeve and the liquid inlet valve sleeve to be unscrewed, causing the valve core assembly to be unable to be completely removed from the valve body.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a valve core assembly to facilitate the disassembly of the reversing valve body.

In order to achieve the above object, the technical solution adopted by the present invention is: a valve core assembly, including a liquid inlet valve sleeve, a liquid return valve sleeve that is threadedly connected to the liquid inlet valve sleeve, and a pressure rod that is movable and disposed in the liquid return valve sleeve. and a threaded sleeve provided on the liquid return valve sleeve and used to form a threaded connection with the valve body of the reversing valve. The screw sleeve has an external thread and is arranged to be rotatable relative to the liquid return valve sleeve.

The screw sleeve has an annular structure. The screw sleeve is sleeved on the liquid return valve sleeve. The screw sleeve and the liquid return valve sleeve are coaxially arranged. An external thread is provided on the outer circumferential surface of the screw sleeve.

The valve core assembly also includes a locking mechanism, which is configured to prevent relative movement of the threaded sleeve and the liquid return valve sleeve in the axial direction and to enable relative rotation of the threaded sleeve and the liquid return valve sleeve. .

The screw sleeve has a receiving groove for accommodating the locking mechanism, and the liquid return valve sleeve has a locking groove for the locking mechanism to be embedded.

The accommodating grooves are multiple evenly arranged along the circumferential direction on the side wall of the screw sleeve, and the locking grooves are annular grooves extending along the entire circumferential direction on the outer circumferential surface of the liquid return valve sleeve. , a locking mechanism is provided in each accommodation groove.

The locking mechanism includes a locking piece embedded in the locking groove and the accommodating groove, and a pressing piece that exerts pressure on the locking piece to fix it.

The locking piece is spherical, and the cross section of the locking groove is semicircular.

The pressing member is a screw threadedly connected to the threaded sleeve.

The invention also provides a reversing valve, which includes a valve body and the above-mentioned valve core assembly.

The valve core assembly of the present invention is threadedly connected to the valve body of the reversing valve by arranging a threaded sleeve on the liquid return valve sleeve, so that the liquid inlet valve sleeve will not loosen from the liquid return valve sleeve due to the existence of frictional resistance during disassembly. Detachment improves the reliability of the connection between the liquid return valve sleeve and the liquid inlet valve sleeve, ensuring that the valve core assembly can be removed from the valve body as a whole.

Description of drawings

This manual includes the following drawings, which show:

Figure 1 is a cross-sectional view of the valve core assembly of Embodiment 1;

Figure 2 is a cross-sectional view of the valve core assembly of Embodiment 2;

The marks in the picture are: 1. Pressure rod; 2. Liquid return valve sleeve; 3. Guide sleeve; 4. Liquid inlet valve sleeve; 5. Valve core; 6. Spring; 7. First liquid hole; 8. Second Liquid hole; 9. First oil passage; 10. Second oil passage; 11. Sealing part; 12. Screw sleeve; 13. Locking piece; 14. Pressing piece; 15. Sealing ring; 16. Third passage liquid hole.

Detailed ways

The specific implementation modes of the present invention will be further described in detail below by describing the embodiments with reference to the accompanying drawings. The purpose is to help those skilled in the art have a more complete, accurate and in-depth understanding of the concepts and technical solutions of the present invention, and contribute to its implementation.

It should be noted that in the following embodiments, the “first” and “second” mentioned do not represent an absolute distinction in structure and/or function, nor does it represent a sequence of execution, but is merely for the purpose of Ease of description.

Embodiment 1

As shown in Figure 1, this embodiment provides a valve core assembly, which includes a liquid inlet valve sleeve 4, a liquid return valve sleeve 2 that is threadedly connected to the liquid inlet valve sleeve 4, and a liquid return valve sleeve 2 that is movably disposed on the liquid inlet valve sleeve 4. The pressure rod 1 and the threaded sleeve 12 arranged on the liquid return valve sleeve 2 and used to form a threaded connection with the valve body of the reversing valve, the screw sleeve 12 has external threads and the screw sleeve 12 is arranged relative to the liquid return valve sleeve 2 can be rotated.

Specifically, as shown in Figure 1, the valve core assembly of this embodiment also includes a valve core, a guide sleeve 3 and a spring that are sleeved on the valve core. The valve core is movably provided in the liquid inlet valve sleeve 4 and The valve core, the liquid inlet valve sleeve 4 and the pressure rod 1 are coaxially arranged. The liquid return valve sleeve 2 is set on the pressure rod 1. The interior of the liquid return valve sleeve 2 is provided with an inner hole that matches the external shape of the pressure rod 1. The cross section of the pressure rod 1 is convex, and the head of the pressure rod 1 comes from the return The end of the liquid valve sleeve 2 protrudes, and the inside of the pressure rod 1 is provided with an inner hole extending in the axial direction from the end surface. The main body of the valve core is cylindrical. The valve core has a structure with openings at both ends and a hollow interior. The interior of the valve core is a hollow oil passage extending along the axial direction. The valve core cooperates with the pressure rod 1 to achieve sealing. The guide sleeve 3 is sandwiched between the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2. The guide sleeve 3 is located inside the liquid return valve sleeve 2 and is set on the valve core, which is convenient for disassembly and assembly, and enables the valve core assembly to form An integral plug-in structure with high integration and convenient installation and disassembly in the valve body of the reversing valve.

As shown in Figure 1, the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2 are cylindrical structures with openings at both ends and a hollow interior. One end of the liquid inlet valve sleeve 4 is inserted into the open end of the liquid return valve sleeve 2 and both For a threaded connection, an external thread is provided on the outer wall of the end of the liquid inlet valve sleeve 4, and an internal thread is provided on the inner wall of the open end of the liquid return valve sleeve 2. The cylindrical side wall of the liquid inlet valve sleeve 4 is provided with a first liquid hole 7 for allowing liquid to pass through. The first liquid hole 7 is a circular through hole provided through the cylindrical side wall of the liquid inlet valve sleeve 4 . A plurality of first liquid holes 7 are evenly arranged along the circumferential direction on the cylindrical side wall of the liquid inlet valve sleeve 4. A liquid inlet cavity is formed inside the liquid inlet valve sleeve 4. The first liquid holes are connected with the liquid inlet cavity. The chambers are connected, and the emulsion enters the liquid inlet chamber from the first liquid hole 7 . The cylindrical side wall of the liquid return valve sleeve 2 is provided with a third liquid passage hole 16 for allowing liquid to pass through. The third liquid passage hole 16 is a circular passage provided through the cylindrical side wall of the liquid return valve sleeve 2. , a liquid return chamber is formed inside the liquid return valve sleeve 2, and the third liquid hole 16 is connected with the liquid return chamber. The first liquid hole 7 provided on the liquid inlet valve sleeve 4 is a circular through hole, and the third liquid hole 16 provided on the liquid return valve sleeve 2 is a circular through hole. The axis of the third liquid hole 16 There is an included angle with the axis of the liquid return valve sleeve 2, and the included angle is an acute angle, that is, the third liquid hole 16 also adopts an inclined hole design, so that the liquid flows out more smoothly, the resistance loss is smaller, and it is easy to process.

As shown in Figure 1, the inner center of the valve core has a hollow oil passage arranged along the axial direction. The hollow oil passage includes a first oil passage 9 and a second oil passage 10 that are connected and arranged sequentially along the axial direction. The diameter of the first oil passage 9 is larger than the diameter of the second oil passage 10 and the first oil passage 9 is located between the second oil passage 10 and the working port provided on the end face of the valve body. The second oil passage 10 is located between the pressure rod 1 and the first oil passage 10. Between 9 oil passages. The first oil passage 9 and the second oil passage 10 are coaxially arranged, and the length of the second oil passage 10 is greater than the length of the first oil passage 9 . By arranging the hollow oil passage in the valve core 5 to consist of a large-diameter first oil passage 9 and a small-diameter second oil passage 10, when high-pressure liquid enters from between the valve core and the guide sleeve 3, it can be It can transport liquid efficiently and form a buffer zone when liquid returns to the working port, thereby better ensuring the laminar flow of liquid. The cylindrical side wall of the valve core is provided with a second liquid hole 8 for allowing liquid to pass through. The second liquid hole 8 is a circular hole provided through the cylindrical side wall of the valve core surrounding the second oil passage 10. A plurality of second liquid passage holes 8 are evenly arranged along the circumferential direction on the cylindrical side wall of the valve core. The second liquid passage holes 8 are connected with the second oil passage 10 and their axes are perpendicular to each other. When the valve core assembly is in its initial state, the second liquid hole 8 is aligned with the guide sleeve 3 and is closed by the guide sleeve 3 and the corresponding seal.

As shown in Figure 1, the valve core has a sealing portion 11 and a conical surface is provided on the outer surface of the sealing portion 11. The end of the guide sleeve 3 is provided with a conical surface sealing connection with the sealing portion 11 and there is a line between them. The arc surface in contact cooperates with the sealing portion 11 to play a sealing role. The sealing portion 11 is a complete annular structure disposed on the side wall of the valve core and protruding outward. It is coaxial with the valve core and is located in the inner cavity of the liquid inlet valve sleeve 4 . In the axial direction of the valve core, the sealing portion 11 is located between the first oil passage 9 and the second liquid hole 8 . There is also a spring 6 set outside the valve core. The spring 6 is located in the liquid inlet valve sleeve 4. One end of the spring 6 is against the end surface of the sealing portion 11 of the valve core, and the other end is against the liquid inlet valve sleeve 4. on a stepped surface near the end. When the valve core assembly is in its initial state, the spring 6 pushes the valve core to move toward the pressure rod 1 until the sealing portion 11 contacts the arc surface on the guide sleeve 3 to achieve sealing. In addition, O-rings are respectively provided between the two ends of the valve core and the liquid inlet valve sleeve 4 and the guide sleeve 3. The second liquid hole 8 and the sealing portion 11 are located between the O-rings at both ends of the valve core. Ensure the liquid inlet chamber is sealed.

In the initial state as shown in Figure 1, the valve is closed, the valve core and the guide sleeve 3 are sealed, the liquid inlet chamber of the liquid inlet valve sleeve 4 is not connected to the oil passage in the valve core, and the oil passage is blocked. ; When the valve needs to be opened, pull the handle of the reversing valve toward the working port where the emulsion needs to flow out. The pressure rod 1 pushes the valve core to move. The sealing part 11 of the valve core is separated from the arc surface of the guide sleeve 3. The liquid inlet valve The liquid inlet chamber of sleeve 4 is connected with the oil passage in the valve core through the second liquid passage hole 8. The emulsion can enter the liquid inlet chamber, and then enter the internal oil passage of the valve core from the second liquid passage hole 8 on the valve core. Since the valve core and the pressure rod 1 are sealed at this time, the emulsion can flow from the internal oil passage of the valve core into the working port on the valve body. After closing the valve, the emulsion in the liquid outlet chamber flows back to the emulsion pump station through the third liquid hole on the liquid return valve sleeve 2 and the main liquid return hole of the valve body.

The pressure rod 1, guide sleeve 3 and valve core of the valve core assembly are made of the same material, which is 3Cr13. When the pressure rod 1 moves toward the valve core under the action of external force, when the inner wall of the pressure rod 1 contacts the outer wall of the valve core, there is a hard seal connection between the pressure rod 1 and the end of the valve core, as shown in Figure 1 , the end of the valve core facing the pressure rod 1 is a frustum structure. The taper of the outer cone surface of the frustum structure is 60 degrees. An arc surface is processed at the entrance of the inner hole of the pressure rod 1, so that the pressure rod 1 A rounded corner is formed at the entrance of the inner hole, and the arc surface is in line contact with the outer cone surface at the end of the valve core. That is, a single cone inner hole arc surface sealing structure is formed between the valve core and the pressure rod 1. . When the valve core assembly is in its initial state, the sealing portion 11 of the valve core and the arc surface of the guide sleeve 3 are also connected with a hard seal. A conical surface with a taper of 60 degrees is machined on the outer surface of the sealing portion 11. The valve core A single cone outer circular surface sealing structure is formed between the guide sleeve 3 and the guide sleeve 3 .

The valve core assembly adopts the above-mentioned sealing structure composed of a single cone inner hole arc surface and a single cone outer circular surface. The sealing form is a hard seal, that is, a ring line seal. Compared with the seal made of soft materials, the hard seal not only has better sealing performance, but also has better sealing performance. It can also withstand ultra-high pressure, which can effectively extend the service life of the seal pair, extend the service life of the valve core assembly, and improve the sealing reliability of the valve core assembly. When applied to the reversing valve, it can greatly improve the reversing valve's reliability. Trouble-free working hours.

As shown in Figure 1, the liquid inlet valve sleeve 4 is provided with a sealing ring 16. The sealing ring 16 is an O-ring. The sealing ring 16 is located between the liquid inlet valve sleeve 4 and the valve body. The sealing ring 16 is connected to the valve body. The inner circular surfaces of the valve chamber are in contact. The screw sleeve 12 has an annular structure. The screw sleeve 12 is sleeved on the liquid return valve sleeve 2 and the screw sleeve 12 and the liquid return valve sleeve 2 are coaxially arranged. The outer circumferential surface of the screw sleeve 12 is provided with external threads. The valve body of the reversing valve has a valve cavity that accommodates the valve core assembly. The valve cavity is a circular cavity. The valve body and the threaded sleeve 12 are threaded. Threads are provided on the inner circumferential surface of the valve cavity of the valve body. The screw sleeve 12 is set on the liquid return valve sleeve 2 and the screw sleeve 12 can rotate around its axis relative to the liquid return valve sleeve 2. In this way, during the process of disassembling the valve core assembly from the valve body of the reversing valve, the screw sleeve 12 can be rotated relative to the liquid return valve sleeve 2. 12. Unscrew the screw sleeve 12 from the valve body cavity. The screw sleeve 12 will not drive the liquid return valve sleeve 2 to rotate. Due to the existence of the sealing rings provided on the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2, The sealing ring and the valve body cavity are extruded to form a large friction resistance. When disassembled, the liquid inlet valve sleeve 4 will not be separated from the liquid return valve sleeve 2 due to the existence of friction resistance, which improves the connection between the liquid return valve sleeve 2 and the inlet valve sleeve 2. The reliability of the connection of the liquid valve sleeve 4 ensures that the valve core assembly can be completely removed from the valve body.

As shown in Figure 1, the valve core assembly of this embodiment also includes a locking mechanism. The locking mechanism is configured to prevent the screw sleeve 12 and the liquid return valve sleeve 2 from moving relative to each other in the axial direction and to allow the screw sleeve 12 and the liquid return valve sleeve 2 to move relative to each other in the axial direction. The valve sleeve 2 is capable of relative rotation. The liquid inlet valve sleeve 4 is threadedly connected to one end of the liquid return valve sleeve 2 in the length direction, and the screw sleeve 12 is installed on the other end of the liquid return valve sleeve 2 in the length direction through a locking mechanism. This end of the valve body is located at the opening provided on the end face of the valve body, and the threaded sleeve 12 is also located at this opening, which facilitates the disassembly and assembly of the valve core assembly and the valve body. During disassembly and assembly, the screw sleeve 12 can be rotated. After the screw sleeve 12 is completely unscrewed from the valve cavity of the valve body, the valve core assembly can be pulled out from the valve body cavity to complete the disassembly of the valve core assembly; screw the screw sleeve 12 completely into the valve cavity of the valve body. Finally, complete the installation of the valve core assembly.

As shown in FIG. 1 , the locking mechanism can prevent the threaded sleeve 12 and the liquid return valve sleeve 2 from moving relative to each other in the axial direction and enable the threaded sleeve 12 and the liquid return valve sleeve 2 to rotate relative to each other. In this way, during the assembly and disassembly of the valve core assembly and the valve body, the screw sleeve 12 can rotate around its axis relative to the liquid return valve sleeve 2. Compared with the reversing method in the prior art, The liquid return valve sleeve 2 in the valve is connected to the valve body through threads. The locking mechanism can avoid the liquid return valve sleeve caused by the frictional resistance caused by the sealing ring set on the outside of the liquid inlet valve sleeve 4 and the inner wall of the valve body. 2 and the liquid inlet valve sleeve 4 are loose, causing the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2 to separate, thereby improving the reliability of the connection between the liquid return valve sleeve 2 and the liquid inlet valve sleeve 4. The screw sleeve 12 has a receiving groove for accommodating the locking mechanism, and the liquid return valve sleeve 2 has a locking groove for the locking mechanism to be embedded. The accommodating groove is a through hole provided in the radial direction on the side wall of the screw sleeve 12 and multiple accommodating grooves are evenly provided on the side wall of the screw sleeve 12 along the circumferential direction. The locking groove is in the liquid return valve sleeve 2 An annular groove extending along the entire circumference of the outer circumference. There are multiple locking mechanisms and the plurality of locking mechanisms are evenly distributed along the circumferential direction. The number of accommodating grooves 23 is the same as the number of locking mechanisms. Each locking mechanism is respectively embedded in an accommodating groove. The axis of the accommodating groove is Perpendicular to the axis of the threaded sleeve 12 , the accommodating groove is a through hole provided in the radial direction on the side wall of the threaded sleeve 12 .

As shown in FIG. 1 , the locking mechanism includes a locking piece 13 that is simultaneously embedded in the locking groove and the accommodating groove, and a pressing piece 14 that exerts pressure on the locking piece 13 to fix it. The locking member 13 is preferably spherical, the cross-section of the locking groove is semicircular, and the pressing member 14 is preferably a screw inserted into the accommodating groove and threadedly connected to the threaded sleeve 12 . The pressing piece 14 is screwed into the accommodating groove, and the locking piece 13 is pressed tightly, so that part of the locking piece 13 is embedded in the accommodating groove, and the other part is embedded in the locking groove, so that the screw sleeve 12 and the liquid return valve sleeve can be realized 2, and can enable relative rotation between the screw sleeve 12 and the liquid return valve sleeve 2, and the screw sleeve 12 and the liquid return valve sleeve 2 will not be separated. The locking groove is a round groove, and the locking piece 13 is a spherical piece that matches the locking groove, which can increase the rotation efficiency of the liquid return valve sleeve 2 and reduce the friction resistance. During the rotation of the liquid return valve sleeve 2, the locking piece 13 can slide circumferentially in the locking groove.

Preferably, the thread sleeve 12 is made of No. 45 steel, and the valve body is made of No. 45 steel, which will not cause thread engagement problems after the stainless steel is pressed. The material of the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2 is the same, which is 1Cr17Ni2.

This embodiment also provides a reversing valve, including a valve body and a valve core assembly with the above structure. The specific structure of this valve core assembly can be referred to as shown in Figure 1 and will not be described again here. Since the reversing valve of the present invention includes the valve core assembly in the above embodiment, it has all the advantages of the above valve core assembly.

Embodiment 2

As shown in Figure 2, this embodiment provides a valve core assembly, which includes a liquid inlet valve sleeve 4, a liquid return valve sleeve 2 that is threadedly connected to the liquid inlet valve sleeve 4, and a liquid return valve sleeve 2 that is movably disposed on the liquid inlet valve sleeve 4. The pressure rod 1 and the threaded sleeve 12 arranged on the liquid return valve sleeve 2 and used to form a threaded connection with the valve body of the reversing valve, the screw sleeve 12 has external threads and the screw sleeve 12 is arranged relative to the liquid return valve sleeve 2 can be rotated.

Specifically, as shown in Figure 2, the valve core assembly of this embodiment also includes a valve core, a guide sleeve 3 and a spring that are sleeved on the valve core. The valve core is movably provided in the liquid inlet valve sleeve 4 and The valve core, the liquid inlet valve sleeve 4 and the pressure rod 1 are coaxially arranged. The liquid return valve sleeve 2 is set on the pressure rod 1. The interior of the liquid return valve sleeve 2 is provided with an inner hole that matches the external shape of the pressure rod 1. The cross section of the pressure rod 1 is convex, and the head of the pressure rod 1 comes from the return The end of the liquid valve sleeve 2 protrudes, and the inside of the pressure rod 1 is provided with an inner hole extending in the axial direction from the end surface. The main body of the valve core is cylindrical. The valve core has a structure with openings at both ends and a hollow interior. The interior of the valve core is a hollow oil passage extending along the axial direction. The valve core cooperates with the pressure rod 1 to achieve sealing. The guide sleeve 3 is sandwiched between the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2. The guide sleeve 3 is located inside the liquid return valve sleeve 2 and is set on the valve core, which is convenient for disassembly and assembly, and enables the valve core assembly to form An integral plug-in structure with high integration and convenient installation and disassembly in the valve body of the reversing valve.

As shown in Figure 2, the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2 are cylindrical structures with openings at both ends and a hollow interior. One end of the liquid return valve sleeve 2 is inserted into the open end of the liquid inlet valve sleeve 4 and both For a threaded connection, an external thread is provided on the outer wall of the end of the liquid return valve sleeve 2, and an internal thread is provided on the inner wall of the open end of the liquid inlet valve sleeve 4. The cylindrical side wall of the liquid inlet valve sleeve 4 is provided with a first liquid hole 7 for allowing liquid to pass through. The first liquid hole 7 is a circular through hole provided through the cylindrical side wall of the liquid inlet valve sleeve 4 . A plurality of first liquid holes 7 are evenly arranged along the circumferential direction on the cylindrical side wall of the liquid inlet valve sleeve 4. A liquid inlet cavity is formed inside the liquid inlet valve sleeve 4. The first liquid holes are connected with the liquid inlet cavity. The chambers are connected, and the emulsion enters the liquid inlet chamber from the first liquid hole 7 . The cylindrical side wall of the liquid return valve sleeve 2 is provided with a third liquid passage hole 16 for allowing liquid to pass through. The third liquid passage hole 16 is a circular passage provided through the cylindrical side wall of the liquid return valve sleeve 2. , a liquid return chamber is formed inside the liquid return valve sleeve 2, and the third liquid hole 16 is connected with the liquid return chamber. The first liquid hole 7 provided on the liquid inlet valve sleeve 4 is a circular through hole, and the third liquid hole 16 provided on the liquid return valve sleeve 2 is a circular through hole. The axis of the first liquid hole 7 There is an included angle with the axis of the liquid inlet valve sleeve 44, and the included angle is an acute angle, that is, the first liquid hole 7 adopts an inclined hole design, so that the liquid can enter more smoothly, the resistance loss is smaller, and it is easy to process.

As shown in Figure 2, the inner center of the valve core has a hollow oil passage arranged along the axial direction. The hollow oil passage includes a first oil passage 9 and a second oil passage 10 that are connected and arranged sequentially along the axial direction. The diameter of the first oil passage 9 is larger than the diameter of the second oil passage 10 and the first oil passage 9 is located between the second oil passage 10 and the working port provided on the end face of the valve body. The second oil passage 10 is located between the pressure rod 1 and the first oil passage 10. Between 9 oil passages. The first oil passage 9 and the second oil passage 10 are coaxially arranged, and the length of the second oil passage 10 is greater than the length of the first oil passage 9 . By arranging the hollow oil passage in the valve core 5 to consist of a large-diameter first oil passage 9 and a small-diameter second oil passage 10, when high-pressure liquid enters from between the valve core and the guide sleeve 3, it can be It can transport liquid efficiently and form a buffer zone when liquid returns to the working port, thereby better ensuring the laminar flow of liquid. The cylindrical side wall of the valve core is provided with a second liquid hole 8 for allowing liquid to pass through. The second liquid hole 8 is a circular hole provided through the cylindrical side wall of the valve core surrounding the second oil passage 10. A plurality of second liquid passage holes 8 are evenly arranged along the circumferential direction on the cylindrical side wall of the valve core. The second liquid passage holes 8 are connected with the second oil passage 10 and their axes are perpendicular to each other. When the valve core assembly is in its initial state, the second liquid hole 8 is aligned with the guide sleeve 3 and is closed by the guide sleeve 3 and the corresponding seal.

As shown in Figure 2, the valve core has a sealing part 11 and a conical surface is provided on the outer surface of the sealing part 11. The end of the guide sleeve 3 is provided with a conical surface sealing connection with the sealing part 11 and there is a line between them. The arc surface in contact cooperates with the sealing portion 11 to play a sealing role. The sealing portion 11 is a complete annular structure disposed on the side wall of the valve core and protruding outward. It is coaxial with the valve core and is located in the inner cavity of the liquid inlet valve sleeve 4 . In the axial direction of the valve core, the sealing portion 11 is located between the first oil passage 9 and the second liquid hole 8 . There is also a spring 6 set outside the valve core. The spring 6 is located in the liquid inlet valve sleeve 4. One end of the spring 6 is against the end surface of the sealing portion 11 of the valve core, and the other end is against the liquid inlet valve sleeve 4. on a stepped surface near the end. When the valve core assembly is in its initial state, the spring 6 pushes the valve core to move toward the pressure rod 1 until the sealing portion 11 contacts the arc surface on the guide sleeve 3 to achieve sealing. In addition, O-rings are respectively provided between the two ends of the valve core and the liquid inlet valve sleeve 4 and the guide sleeve 3. The second liquid hole 8 and the sealing portion 11 are located between the O-rings at both ends of the valve core. Ensure the liquid inlet chamber is sealed.

In the initial state as shown in Figure 2, the valve is closed, the valve core and the guide sleeve 3 are sealed, the liquid inlet chamber of the liquid inlet valve sleeve 4 is not connected to the oil passage in the valve core, and the oil passage is blocked. ; When the valve needs to be opened, pull the handle of the reversing valve toward the working port where the emulsion needs to flow out. The pressure rod 1 pushes the valve core to move. The sealing part 11 of the valve core is separated from the arc surface of the guide sleeve 3. The liquid inlet valve The liquid inlet chamber of sleeve 4 is connected with the oil passage in the valve core through the second liquid passage hole 8. The emulsion can enter the liquid inlet chamber, and then enter the internal oil passage of the valve core from the second liquid passage hole 8 on the valve core. Since the valve core and the pressure rod 1 are sealed at this time, the emulsion can flow from the internal oil passage of the valve core into the working port on the valve body. After closing the valve, the emulsion in the liquid outlet chamber flows back to the emulsion pump station through the third liquid hole on the liquid return valve sleeve 2 and the main liquid return hole of the valve body.

The pressure rod 1, guide sleeve 3 and valve core of the valve core assembly are made of the same material, which is 3Cr13. When the pressure rod 1 moves toward the valve core under the action of external force, when the inner wall of the pressure rod 1 contacts the outer wall of the valve core, there is a hard seal connection between the pressure rod 1 and the end of the valve core, as shown in Figure 2 , the end of the valve core facing the pressure rod 1 is a frustum structure. The taper of the outer cone surface of the frustum structure is 60 degrees. An arc surface is processed at the entrance of the inner hole of the pressure rod 1, so that the pressure rod 1 A rounded corner is formed at the entrance of the inner hole, and the arc surface is in line contact with the outer cone surface at the end of the valve core. That is, a single cone inner hole arc surface sealing structure is formed between the valve core and the pressure rod 1. . When the valve core assembly is in its initial state, the sealing portion 11 of the valve core and the arc surface of the guide sleeve 3 are also connected with a hard seal. A conical surface with a taper of 60 degrees is machined on the outer surface of the sealing portion 11. The valve core A single cone outer circular surface sealing structure is formed between the guide sleeve 3 and the guide sleeve 3 .

The valve core assembly adopts the above-mentioned sealing structure composed of a single cone inner hole arc surface and a single cone outer circular surface. The sealing form is a hard seal, that is, a ring line seal. Compared with the seal made of soft materials, the hard seal not only has better sealing performance, but also has better sealing performance. It can also withstand ultra-high pressure, which can effectively extend the service life of the seal pair, extend the service life of the valve core assembly, and improve the sealing reliability of the valve core assembly. When applied to the reversing valve, it can greatly improve the reversing valve's reliability. Trouble-free working hours.

As shown in Figure 2, the liquid inlet valve sleeve 4 is provided with a sealing ring 16. The sealing ring 16 is an O-ring. The sealing ring 16 is located between the liquid inlet valve sleeve 4 and the valve body. The sealing ring 16 is connected to the valve body. The inner circular surfaces of the valve chamber are in contact. The screw sleeve 12 has an annular structure. The screw sleeve 12 is sleeved on the liquid return valve sleeve 2 and the screw sleeve 12 and the liquid return valve sleeve 2 are coaxially arranged. The outer circumferential surface of the screw sleeve 12 is provided with external threads. The valve body of the reversing valve has a valve cavity that accommodates the valve core assembly. The valve cavity is a circular cavity. The valve body and the thread sleeve 12 are threaded. Threads are provided on the inner circumferential surface of the valve cavity of the valve body. The screw sleeve 12 is set on the liquid return valve sleeve 2 and the screw sleeve 12 can rotate around its axis relative to the liquid return valve sleeve 2. In this way, during the process of disassembling the valve core assembly from the valve body of the reversing valve, the screw sleeve 12 can be rotated relative to the liquid return valve sleeve 2. 12. Unscrew the threaded sleeve 12 from the valve cavity of the valve body. The threaded sleeve 12 will not drive the liquid return valve sleeve 2 to rotate. Due to the existence of the sealing rings provided on the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2, The sealing ring and the valve body cavity are extruded to form a large friction resistance. When disassembled, the liquid inlet valve sleeve 4 will not be separated from the liquid return valve sleeve 2 due to the existence of friction resistance, which improves the connection between the liquid return valve sleeve 2 and the inlet valve sleeve 2. The reliability of the connection of the liquid valve sleeve 4 ensures that the valve core assembly can be completely removed from the valve body.

As shown in Figure 2, the valve core assembly of this embodiment also includes a locking mechanism. The locking mechanism is configured to prevent the threaded sleeve 12 and the liquid return valve sleeve 2 from moving relative to each other in the axial direction and to allow the threaded sleeve 12 and the liquid return valve sleeve 2 to move relative to each other in the axial direction. The valve sleeve 2 is capable of relative rotation. The liquid inlet valve sleeve 4 is threadedly connected to one end of the liquid return valve sleeve 2 in the length direction, and the screw sleeve 12 is installed on the other end of the liquid return valve sleeve 2 in the length direction through a locking mechanism. This end of the valve body is located at the opening provided on the end face of the valve body, and the threaded sleeve 12 is also located at this opening, which facilitates the disassembly and assembly of the valve core assembly and the valve body. During disassembly and assembly, the screw sleeve 12 can be rotated. After the screw sleeve 12 is completely unscrewed from the valve cavity of the valve body, the valve core assembly can be pulled out from the valve body cavity to complete the disassembly of the valve core assembly; screw the screw sleeve 12 completely into the valve cavity of the valve body. Finally, complete the installation of the valve core assembly.

As shown in FIG. 2 , the locking mechanism can prevent the threaded sleeve 12 and the liquid return valve sleeve 2 from moving relative to each other in the axial direction and enable the threaded sleeve 12 and the liquid return valve sleeve 2 to rotate relative to each other. In this way, during the assembly and disassembly of the valve core assembly and the valve body, the screw sleeve 12 can rotate around its axis relative to the liquid return valve sleeve 2. Compared with the reversing method in the prior art, The liquid return valve sleeve 2 in the valve is connected to the valve body through threads. The locking mechanism can avoid the liquid return valve sleeve caused by the frictional resistance caused by the sealing ring set on the outside of the liquid inlet valve sleeve 4 and the inner wall of the valve body. 2 and the liquid inlet valve sleeve 4 are loose, causing the liquid inlet valve sleeve 4 and the liquid return valve sleeve 2 to separate, thereby improving the reliability of the connection between the liquid return valve sleeve 2 and the liquid inlet valve sleeve 4. The screw sleeve 12 has a receiving groove for accommodating the locking mechanism, and the liquid return valve sleeve 2 has a locking groove for the locking mechanism to be embedded. The accommodating groove is a through hole provided in the radial direction on the side wall of the screw sleeve 12 and multiple accommodating grooves are evenly provided on the side wall of the screw sleeve 12 along the circumferential direction. The locking groove is in the liquid return valve sleeve 2 An annular groove extending along the entire circumference of the outer circumference. There are multiple locking mechanisms and the plurality of locking mechanisms are evenly distributed along the circumferential direction. The number of accommodating grooves 23 is the same as the number of locking mechanisms. Each locking mechanism is respectively embedded in an accommodating groove. The axis of the accommodating groove is Perpendicular to the axis of the threaded sleeve 12 , the accommodating groove is a through hole provided in the radial direction on the side wall of the threaded sleeve 12 .

As shown in FIG. 2 , the locking mechanism includes a locking piece 13 that is simultaneously embedded in the locking groove and the accommodating groove, and a pressing piece 14 that exerts pressure on the locking piece 13 to fix it. The locking member 13 is preferably spherical, the cross-section of the locking groove is semicircular, and the pressing member 14 is preferably a screw inserted into the accommodating groove and threadedly connected to the threaded sleeve 12 . The pressing piece 14 is screwed into the accommodating groove, and the locking piece 13 is pressed tightly, so that part of the locking piece 13 is embedded in the accommodating groove, and the other part is embedded in the locking groove, so that the screw sleeve 12 and the liquid return valve sleeve can be realized 2, and can enable relative rotation between the screw sleeve 12 and the liquid return valve sleeve 2, and the screw sleeve 12 and the liquid return valve sleeve 2 will not be separated. The locking groove is a round groove, and the locking piece 13 is a spherical piece that matches the locking groove, which can increase the rotation efficiency of the liquid return valve sleeve 2 and reduce the friction resistance. During the rotation of the liquid return valve sleeve 2, the locking piece 13 can slide circumferentially in the locking groove.

Preferably, the thread sleeve 12 is made of No. 45 steel, and the valve body is made of No. 45 steel, which will not cause thread engagement problems after the stainless steel is pressed. The liquid inlet valve sleeve 4 and the liquid return valve sleeve 2 are made of the same material, both of which are No. 45 steel.

This embodiment also provides a reversing valve, including a valve body and a valve core assembly with the above structure. The specific structure of this valve core assembly can be referred to as shown in Figure 2 and will not be described again here. Since the reversing valve of the present invention includes the valve core assembly in the above embodiment, it has all the advantages of the above valve core assembly.

The present invention has been exemplarily described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above manner. As long as various non-substantive improvements are made using the method concepts and technical solutions of the present invention; or the above-mentioned concepts and technical solutions of the present invention are directly applied to other situations without improvement, they all fall within the protection scope of the present invention. within.

Claims (8)

1. The valve core assembly includes a liquid inlet valve sleeve, a liquid return valve sleeve that is threadedly connected to the liquid inlet valve sleeve, and a pressure rod that is movable and disposed in the liquid return valve sleeve. It is characterized in that: it also includes a liquid return valve sleeve that is threadedly connected to the liquid inlet valve sleeve. A threaded sleeve is provided on the liquid return valve sleeve and used to form a threaded connection with the valve body of the reversing valve. The screw sleeve has an external thread and is arranged to be rotatable relative to the liquid return valve sleeve; The valve core assembly also includes a valve core, a guide sleeve and a spring that are sleeved on the valve core. The valve core is movably arranged in the liquid inlet valve sleeve, and the valve core, the liquid inlet valve sleeve and the pressure rod are coaxially arranged. ;The guide sleeve is sandwiched between the liquid inlet valve sleeve and the liquid return valve sleeve. The guide sleeve is located inside the liquid return valve sleeve and is set on the valve core; The liquid return valve sleeve is set on the pressure rod. The interior of the liquid return valve sleeve is provided with an inner hole that matches the external shape of the pressure rod. The cross section of the pressure rod is convex. The head of the pressure rod extends from the end of the liquid return valve sleeve. Out, the inside of the pressure rod is equipped with an inner hole extending axially from the end surface; the inside of the valve core is a hollow oil passage extending along the axial direction, and the valve core and the pressure rod cooperate to achieve sealing; The liquid inlet valve sleeve and the liquid return valve sleeve are cylindrical structures with openings at both ends and a hollow interior. One end of the liquid inlet valve sleeve is inserted into the open end of the liquid return valve sleeve and the two are threaded. Correspondingly, the liquid inlet valve sleeve is An external thread is provided on the outer wall of the end of the liquid return valve sleeve, and an internal thread is provided on the inner wall of the open end of the liquid return valve sleeve; a first liquid hole is provided on the cylindrical side wall of the liquid inlet valve sleeve to allow liquid to pass; the first liquid hole is in A plurality of cylindrical side walls of the liquid inlet valve sleeve are evenly arranged along the circumferential direction. A liquid inlet cavity is formed inside the liquid inlet valve sleeve. The first liquid hole is connected to the liquid inlet cavity, and the emulsion passes through the first liquid inlet cavity. The liquid hole enters the liquid inlet chamber; the cylindrical side wall of the liquid return valve sleeve is provided with a third liquid hole for allowing liquid to pass through, and the third liquid hole is provided through the cylindrical side wall of the liquid return valve sleeve. The circular passage forms a liquid return chamber inside the liquid return valve sleeve, and the third liquid hole is connected to the liquid return chamber; The inner center of the valve core has a hollow oil passage arranged axially. The hollow oil passage includes a first oil passage and a second oil passage that are connected and arranged sequentially along the axial direction. The diameter of the first oil passage is larger than that of the second oil passage. The diameter of the oil passage and the first oil passage is located between the second oil passage and the working port provided on the end face of the valve body, the second oil passage is located between the pressure rod and the first oil passage; the first oil passage and the second oil passage The channels are coaxially arranged, and the length of the second oil channel is greater than the length of the first oil channel; The cylindrical side wall of the valve core is provided with a second liquid hole for allowing liquid to pass through. The second liquid hole is a circular through hole provided on the cylindrical side wall of the valve core surrounding the second oil passage. , a plurality of second liquid holes are evenly arranged along the circumferential direction on the cylindrical side wall of the valve core, the second liquid holes are connected with the second oil passage, and the axes of the two are perpendicular; when the valve core assembly is in the initial state, The second liquid hole is aligned with the guide sleeve and closed by the guide sleeve and the corresponding seal; The valve core has a sealing part and a conical surface is provided on the outer surface of the sealing part. The end of the guide sleeve is provided with an arc surface that is sealingly connected to the conical surface of the sealing part and is in line contact with the arc surface. It cooperates with the sealing part to perform a sealing function; the sealing part is a complete annular structure provided on the side wall of the valve core and protruding outward, coaxial with the valve core and located in the inner cavity of the liquid inlet valve sleeve; in the valve core In the axial direction, the sealing part is located between the first oil channel and the second liquid hole; there is a spring on the outside of the valve core, and the spring is located in the liquid inlet valve sleeve, and one end of the spring is against the valve core On the end face of the sealing part, the other end is against a step surface set near the end position in the inlet valve sleeve; when the valve core assembly is in the initial state, the spring pushes the valve core to move toward the pressure rod until the sealing part and the guide The arc surface contact on the sleeve achieves sealing; In the initial state, the valve is closed, the valve core and the guide sleeve are sealed, the liquid inlet chamber of the liquid inlet valve sleeve is not connected to the oil passage in the valve core, and the oil path is blocked; when it is necessary to open the valve, move it toward the required direction. Pull the handle of the reversing valve in the direction of the working port where the emulsion flows out, and the pressure rod pushes the valve core to move. The sealing part of the valve core is separated from the arc surface of the guide sleeve. The liquid inlet cavity of the liquid inlet valve sleeve is connected to the second liquid hole through the second liquid hole. The oil passages in the valve core are connected, and the emulsion enters the liquid inlet chamber, and then enters the internal oil passage of the valve core from the second liquid hole on the valve core. Due to the seal between the valve core and the pressure rod at this time, the emulsion flows out of the valve core. The internal oil passage of the core flows into the working port on the valve body; after closing the valve, the emulsion in the liquid outlet chamber flows back to the emulsion pump station through the third liquid hole on the liquid return valve sleeve and the main liquid return hole of the valve body. ; When the pressure rod moves toward the valve core under the action of external force, when the inner wall of the pressure rod contacts the outer wall of the valve core, there is a hard seal connection between the pressure rod and the end of the valve core, and the end of the valve core faces the pressure rod. The outer conical surface of the frustum structure has a taper of degrees. An arc surface is processed at the entrance of the inner hole of the pressure rod, thereby forming a rounded corner at the entrance of the inner hole of the pressure rod. The arc There is a line contact between the outer conical surface of the valve core and the end of the valve core, that is, a single cone inner hole arc surface sealing structure is formed between the valve core and the pressure rod; when the valve core assembly is in the initial state, the sealing portion of the valve core It is also connected with the arc surface of the guide sleeve through a hard seal. A conical surface with a taper of 100 degrees is machined on the outer surface of the sealing part. A single cone outer circular surface sealing structure is formed between the valve core and the guide sleeve. The screw sleeve has a circular structure. The screw sleeve is set on the liquid return valve sleeve and the screw sleeve and the liquid return valve sleeve are coaxially arranged. The outer circumferential surface of the screw sleeve is provided with external threads; the valve body of the reversing valve has an accommodating valve. The valve cavity of the core assembly is a circular cavity. The valve body and the threaded sleeve are threaded. The thread is set on the inner circular surface of the valve cavity of the valve body. The threaded sleeve is set on the liquid return valve sleeve and the threaded sleeves are opposite to each other. The liquid return valve sleeve can rotate around its axis; The valve core assembly further includes a locking mechanism configured to prevent relative movement of the threaded sleeve and the liquid return valve sleeve in the axial direction and to enable relative rotation of the threaded sleeve and the liquid return valve sleeve. 2. The valve core assembly according to claim 1, characterized in that: the screw sleeve has an annular structure, the screw sleeve is sleeved on the liquid return valve sleeve, and the screw sleeve and the liquid return valve sleeve are coaxially arranged. , external threads are provided on the outer circumferential surface of the screw sleeve. 3. The valve core assembly according to claim 1, wherein the screw sleeve has a receiving groove for accommodating the locking mechanism, and the liquid return valve sleeve has a locking groove for the locking mechanism to be embedded. 4. The valve core assembly according to claim 3, characterized in that: a plurality of the receiving grooves are evenly arranged along the circumferential direction on the side wall of the screw sleeve, and the locking grooves are formed on the return side. There is an annular groove extending along the entire circumference on the outer circumferential surface of the liquid valve sleeve, and a locking mechanism is provided in each accommodation groove. 5. The valve core assembly according to claim 3, wherein the locking mechanism includes a locking piece embedded in the locking groove and the accommodating groove and applies pressure to the locking piece to make it Fixed hold-down. 6. The valve core assembly according to claim 5, wherein the locking member is spherical and the locking groove has a semicircular cross-section. 7. The valve core assembly according to claim 6, wherein the pressing member is a screw threadedly connected to the threaded sleeve. 8. A reversing valve, including a valve body, characterized in that it also includes the valve core assembly according to any one of claims 1 to 7.